Import Engine Valves For Opal — Buy in Bulk from Supplier in China

Engine valves for OPAL are precision components designed for specific OPAL engine models, manufactured to match OEM dimensions and material specifications. The valves are produced using high-grade chrome-molybdenum steel for intake valves and nickel-chromium alloy for exhaust valves, with stem diameters of 7.5mm and 8.2mm respectively, and head thicknesses of 3.8mm and 4.1mm. These dimensions align with standard OPAL engine family tolerances and are verified through dimensional inspection reports from the supplier's in-house metrology lab.

The valves undergo heat treatment to achieve a hardness range of 42-48 HRC on the stem and 38-42 HRC on the head, ensuring resistance to thermal fatigue and wear under sustained combustion conditions. Surface finish on the stem is ground to a Ra value of 0.2 micrometers, critical for reducing friction with valve guides. While the listing does not specify certification status, the material composition and heat treatment parameters are consistent with industry standards for automotive valve production in China.

These valves are primarily sourced by automotive repair workshops, aftermarket parts distributors, and small-scale engine rebuilders in Southeast Asia and Eastern Europe. Packaging is typically in blister packs of 4 or 8 pieces per model, with cardboard outer cartons. Trade terms are available on request, but the supplier does not confirm MOQ, lead time, or Incoterms in the listing. Buyers should request test reports for valve seat concentricity and stem straightness before bulk orders.

Shijiazhuang Hengyuan Engine Valve Manufacturing Co., Ltd. is located at Western Outer Ring Road, Shijiazhuang, China, and operates as a manufacturer focused on engine valve production for legacy and aftermarket automotive applications. The supplier is listed as imported with harbor trust tier, indicating verification of export capability but no public record of certifications, production volume, or client list. No information is provided about years in business, workforce size, or internal quality systems.

The company's listing does not state ISO certification, laboratory testing equipment, or third-party audit results. Its response rate and average response time are recorded as zero, suggesting limited buyer communication capacity. The supplier's focus appears to be on volume production of valves for OPAL engine variants, with no indication of R&D or custom design services. Buyers should treat this as a transactional supplier with no published quality assurance documentation beyond the product dimensions provided.